Ribbon Grass

Though it does best with moist soil and partial sun, pest- and disease-free ribbon grass thrives in Zones 4 to 9, in virtually any growing scenario—full sun or shade, wet soil or dry. Though it rarely gets taller than one foot, ribbon grass quickly spreads across even steeply sloped terrain, either to your frustration or delight, depending on your aims. Available on Amazon; $19.99.